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Many recent studies have focused on the use of sunlight to provide indoor lighting and save energy. One approach, the Natural Light Guiding System, uses a static solar concentrator, a fibre optic transmitter and a light emitter to collect sunlight, move it to where it is wanted and distribute it into a room. An important feature of this system is an optical switch that can be used to control and change the direction of the transmitted light. This paper describes the refinement of the optical switch. The refined optical switch uses two lenses to improve light absorption efficiency. The light switch provides light efficiency management controls, such as a switch on and off function and the capability of saving energy in a solar battery.